Matéria seca, carbono e nitrogênio de raízes de soja e milho em plantio direto e convencional

Bordin, Ivan; Neves, Carmen Sílvia Vieira Janeiro; Medina, Cristiane de Conti; Santos, Julio Cezar Franchini dos; Torres, E.; Urquiaga, Segundo

doi:10.1590/s0100-204x2008001200020

Cited by 21 publications

(23 citation statements)

References 17 publications

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“…This result contrasted with that of the conventional tillage system (CT), which did not show stratification of OC at the dose of 100 kg ha reported stratification of OC levels with depth, under NT, with higher levels in the upper layers than CT. Minimum soil disturbance, virtual absence of mechanical incorporation of organic waste into soil layers, and pronounced growth of roots in soil upper layers contribute to the gradient formation of OC levels (Bordin et al, 2008). However, conversion of natural vegetation into agroecosystems via ploughing degrades soil quality, and the mixing of the topsoil with the subsurface decreases organic matter stratification in CT (Franzluebbers, 2002).…”

Section: Resultsmentioning

confidence: 99%

Soil organic matter as affected by management systems, phosphate fertilization, and cover crops

Souza

Figueiredo

Sousa

2016

Pesq. agropec. bras.

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-The objective of this work was to evaluate the effects of soil management systems, cover crops, and phosphate fertilization on soil humic fractions in a long-term experiment. The treatments consisted of conventional tillage and no-tillage with pearl millet (Pennisetum glaucum) or velvet bean (Mucuna aterrima) as cover crops, at two doses of phosphorous: 0 and 100 kg ha -1 P 2 O 5 per year. Soil samples were taken 11 years after the establishment of the experiment and analyzed for soil total organic carbon and carbon content of humic fractions at 0.00-0.05, 0.05-0.10, and 0.10-0.20-m depths. The humic fractions are sensitive to soil management, except free fulvic acid, which was the only one that did not reduce its carbon contents on the surface layer (0.00-0.05 m) with conventional tillage. The main changes occurred on the soil surface layer, in which the no-tillage system with pearl millet as a cover crop provided the highest carbon levels in humic fractions. Long-term phosphate fertilization under no-tillage, with pearl millet as a cover crop, promotes the accumulation of organic carbon in soil humic fractions.Index terms: humic fractions, no-tillage, organic matter fractions, phosphate fertilization, soil fertility, soil quality. Matéria orgânica do solo influenciada por sistemas de manejo, adubação fosfatada e plantas de coberturaResumo -O objetivo deste trabalho foi avaliar os efeitos de sistemas de manejo do solo, de plantas de cobertura e da fertilização fosfatada nas frações húmicas do solo, em experimento de longa duração. Os tratamentos consistiram de sistemas de preparo convencional e de plantio direto com milheto (Pennisetum glaucum) ou com mucuna-preta (Mucuna aterrima) como planta de cobertura, sob duas doses de fósforo: 0 e 100 kg ha -1 de P 2 O 5 por ano. As amostras de solo foram coletadas após 11 anos da implantação do experimento e analisadas quanto aos teores de carbono orgânico total e de carbono das frações humificadas no solo, nas camadas de 0,00-0,05, 0,05-0,10 e 0,10-0,20 m de profundidade. As frações humificadas são sensíveis ao manejo do solo, exceto o ácido fúlvico livre, que foi a única que não diminuiu seus conteúdos de carbono na camada superficial do solo (0,00-0,05 cm) com o plantio convencional. As principais alterações ocorreram na camada superficial, em que o plantio direto com milheto como planta de cobertura promoveu os maiores teores de carbono nas frações húmicas. A fertilização fosfatada por longo tempo sob plantio direto, com milheto como planta de cobertura, promove o acúmulo de carbono orgânico nas frações húmicas do solo.Termos para indexação: frações húmicas, plantio direto, frações da matéria orgânica, fertilização fosfatada, fertilidade do solo, qualidade do solo.

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Section: Resultsmentioning

confidence: 99%

Soil organic matter as affected by management systems, phosphate fertilization, and cover crops

Souza

Figueiredo

Sousa

2016

Pesq. agropec. bras.

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“…This has been mainly attributed to the deposition of large amounts of crop residues, as well as root concentration and decomposition, humus production and residue deposition in the surface layer (Lovato et al, 2004). Maize residues generally contain high levels of recalcitrant fibers such as lignin and have a high C/N ratio, which are favorable aspects in the conversion of this material in humified organic compounds in the soil (Six et al, 2002;Bordin et al, 2008). This layer also concentrates most of the fine roots, which are important sources of humified organic compounds in the soil (Bordin et al, 2008;Kätterer et al, 2011).…”

Section: Resultsmentioning

confidence: 99%

“…Maize residues generally contain high levels of recalcitrant fibers such as lignin and have a high C/N ratio, which are favorable aspects in the conversion of this material in humified organic compounds in the soil (Six et al, 2002;Bordin et al, 2008). This layer also concentrates most of the fine roots, which are important sources of humified organic compounds in the soil (Bordin et al, 2008;Kätterer et al, 2011). The roots grow and spread in the profile, and thus act as a major source of humified organic compounds, which are the main form of OC accumulation in the deeper soil layers under NT (Bayer et al, 2000;Lovato et al, 2004).…”

Section: Resultsmentioning

confidence: 99%

Organic Carbon Contents and Stocks in Particle Size Fractions of a Typic Hapludox Fertilized With Pig Slurry and Soluble Fertilizer

Mafra

Cassol

Albuquerque

et al. 2015

Rev. Bras. Ciênc. Solo

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the use of pig slurry (Ps) as fertilizer can affect the soil quality and increase total stocks of soil organic carbon (tOC). However, the effects of Ps on tOC amount and forms in the soil are not fully understood, particularly in areas under no-tillage (nt). the purpose of this study was to determine tOC contents and stocks in the particulate (POC) and mineral-associated C fractions (MaC) of an Oxisol after nine years of maize-oat rotation under nt, with annual applications of Ps, soluble fertilizer and combined fertilization (pig slurry + soluble fertilizer). the experiment was initiated in 2001 in Campos novos, santa Catarina, with the following treatments: Ps at rates of 0 (without fertilization -Ps0); 25 (Ps25); 50 (Ps50); 100 (Ps100); and 200 m 3 ha -1 yr -1 (Ps200); fertilization with soluble fertilizer (sF); and mixed fertilization (Ps + sF). the tOC content was determined in samples of six soil layers to a depth of 40 cm, and the POC and MaC contents in four layers to a depth of 20 cm. From the rate of 50 m 3 ha -1 yr -1 and upwards, the soil tOC content and stock increased according to the Ps rates in the layers to a depth of 10 cm. the POC and MaC contents and stocks were higher in the surface layers, with a clear predominance of the second fraction, but a greater relative amplitude in the contents of the first fraction.

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“…The effective depth of the root system of maize is between 0.40 m to 0.46 m regardless of the system used, no-tillage or tillage [16]. Therefore, the limestone with different particle sizes provided that the roots of maize reached their effective depth in the soil.…”

Section: --------------------------------------------20 -40 CM ------mentioning

confidence: 99%

Root Growth, Nutrition and Yield of Maize with Applied Different Limestone Particle Size in the Cerrado Soil

Ratke¹,

Pereira²,

Santos³

et al. 2014

AJPS

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Matéria seca, carbono e nitrogênio de raízes de soja e milho em plantio direto e convencional

Cited by 21 publications

References 17 publications

Soil organic matter as affected by management systems, phosphate fertilization, and cover crops

Soil organic matter as affected by management systems, phosphate fertilization, and cover crops

Organic Carbon Contents and Stocks in Particle Size Fractions of a Typic Hapludox Fertilized With Pig Slurry and Soluble Fertilizer

Root Growth, Nutrition and Yield of Maize with Applied Different Limestone Particle Size in the Cerrado Soil

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